Lawn mower



July 4, 1950 B. T. GRoBowsKl 2,513,311

LAWN MowER Filed Jan. 17. 1947 4 Sheets-Sheet 1 INVENTOR. eqIg/Z' 617115001517 July 4, 1950 2,513,311

B. T. G ROBOWSKI LAWN MOWER Filed Jan. 17, 1947 4 Sheets-Sheet 2 IN VEN TOR.

July 4, 1950 B. T. GRoBowsKl 2,513,311

LAWN Mos-1ER Filed Jan. 17, 1947 4 Sheets-Sheet 5 IN VEN TOR.

6 By: n

3611119' Z'mbawski July 4, 1950 B. T. GRoBowsKl LAWN MOWER 4 Sheets-Sheet 4 Filed Jan. 17, 1947 IIIHH Fatentecl July 4, 1950 UNITED STATES PATENT OFFICE 2,513,311 LAWN MoWER Benny T. Grobowski, Newark, Ohio, assigner to The E. T. Rugg Company, Newark, Ohio, a corporation of Qhio Application January 17, 1947, Serial No. 722,641

(Cl. E56-249) distortion or springing of the supporting frame,

the cutting reel, and the cutting bar often occurs upon striking objects in the grass, such as small stones and twigs. springing of any of these parts obviously prevents proper operation of the mower and is generally impossible to correct properly. Another disadvantage of prior art structures resides in the fact that they usually include complicated structures for adjusting the mower to vary the depth of cut and for positioning the cutter bar relative to the cutter reel. Furthermore, these adjustments are difcultto make properly and accurately with such structures and tools usually must be employed. Also, with prior art structures, various operating parts-are not sufliciently protected from clogging by grass and dirt.

One of the objects of my invention is to provide a lawn mower of an extremely rugged construction which is of such a nature that distortion or springing of various parts, which tend to result from striking objects such as stones or twigs, will be precluded.

Another object of my invention is to provide a lawn mower wherein the cutting reel and cooperating cutter bar are both supported by the same rugged frame unit so that there will be no danger of relative displacement or distortion during operation of the mower.

Another object of my invention is to provide a lawn mower having a simple yet effective structure for quickly, easily and accurately adjusting the mower to vary the depth of cut, such adjustment being accomplished without the use of wrenches, screw drivers or other tools and with the setting and resetting of a minimum number of adjusting mechanism parts.

Another object of my invention is to provide simple adjusting mechanism which automatically locks itself but which can be released withilittle eiort in order to adjust the structure for varying the depth of cut of the mower.

Another object of my invention is to provide a simple, effective and easily operable structure in a lawn mower for adjusting the cutting reel ac'- curately relative to the cutter bar, such adjustment also being accomplished without the use of tools.

Still another object of my invention is to provide a lawn mower which is provided with a simple arrangement of structure for protecting the various operating parts thereof completelyA and effectively from clogging by grass or dirt.

Various other objects will be apparent hereinafter.

In its preferred form, I provide a lawn mower in which extreme rigidity is accomplished by providing a transversely extending yoke or frame unit which supports both the cutting reel and the cutter bar in rigid association with each other. The cutter bar is rigidly carried on the bottom portion of the yoke or frame and removably carries a knife. This yoke further serves toaid in connecting together rigidly, insofar as lateral movement is concerned, the side plates of the`4 mower which, in turn, rigidly carry the axles for the supporting wheels. The side plates also carry the transversely extending ground-engaging roller at a point near their rear ends and behind' the yoke. Forward of the yoke there is also provided a transversely extending bumper bar which has its ends connected to the side plates. The

`roller and bumper bar are connected to the side plates in such a manner as to increase the lateral rigidity of thestructure.

The cutting reel is provided with the usual shaft which is supported in bearings, carried `by the vertical arms of the yoke, so that it is substantially parallel to the cutter bar. For accurately adjusting the knives of the cutting reel relative to the knife carried by the cutter bar, an adjustable eccentric is associated with the bearing provided at each end of the cutting reel shaft. Each of these eccentrics may be easily and quickly rotated by means of a worm and gear structure associated therewith which may be actuated by arotatable knob conveniently located. Adjustvvment ofv the eccentrics will move the cutting reel shaft vertically relative to the cutter bar and, i

consequently, the cutting knives of the cutting reel will ybe adjusted accurately relative to the knife carried by the cutter bar. Furthermore, either end ofthe cutting reel shaft may be adjusted independently of the other. Due to the provision of the worm and gear in each of the end adjusting structures, the structure will be self-locking.

In order to provide for proper adjustment to t 3 vary the depth or height of cut of the cutting reel and associated cutter bar knife, I provide means for quickly and easily adjusting the entire assembly, which includes the yoke and the cutting reel and cutter bar carried thereby, vertically relative to the wheels, the side plates and the ground-engaging roller. This is accomplished by providing. inassociationwith each of the side plates a disc which has a gear. segment formed thereon and which is mounted for rotation on the wheel-supporting axle, the gear segment being concentric with the axle. of the yoke is rigidly fastened to one of these gear segment discs and will, consequently, moveA therewith. In order to rotate thegear segment4 discs and, in turn, move the yoke vertically, a

pinion is associated with each gear, segment.

These two pinions may be keyed on opposite ends of the bumper bar which has its ends rotatably mounted in the side plates. The bumper bar may befrotatedto rotate both pinions simultaneously,

by` means of knobs preferably disposed. at-.both

ends ofthe bumper bar adjacent theside plates. Each of these knobs issplined to the bart and` is forced by a spring normally into engagement with the associatedgside plate, intertting; portions being provided onthese members to normally lock the knob and prevent rotation, of.V the bumper bar. Rotation. of the pinions willrotate the gear segment discs aboutthe wheelaxlesand since they carry the yokewhichy supports` the cutting reel and cutter bar, these members will.y

be adjusted vertically relativeto thesupporting wheels so as to vary the d epthof cut;

In .a modified form of. my mower, each` ofthe raising and lowering pinions may be. rotated by.

a train of gears actuated by rotation of the roller supporting shaft, the ends of whicnwillbe-,rotatably carried by the side plates. This shaft may be rotated by an adjusting pinion keyed thereonr adjacent one end thereof and which has. a normally engaged locking means associated therewith.

Theforegoing and other obj ects; and ladvantages of.- the present invention will appear frorn thev following description and appended claims when considered in connection with the` accompanying drawings forming a partI ofthe sp,. ecincationy wherein like reference charactersy designate. corresponding parts in the. several views and` wherein:

Figure l is a perspective View;partly` broken away, of a lawn mower constructed-in` accordance `vwith my invention.

Figure 2 is an inside view of onegendi of the mower. i

Figure 3 is a View of one end; of` the mowery partly in section along line 3-3:- of Figure12 and,` partlyin plan.

Figure 4 is an inside View of theI side platefof the-mower.

Figure 5 is a plan View of the sidel platel of Figure 4.

Figure 6 is anV outside View ofi oneof; the.y

segment-carrying discs of the. heightV adjusting mechanism.

Figure '7 is a planview ofiv theentire mower; structure.

Figure 8 is an inside view, partly invsection, of one end of a mower embodying-:my inventionbutl having modiedy means` for rotating they segment-carrying discs.

Figure 9 is a. horizontal sectionalviewtaken;

along line 9-9 of Figure 8.

With reference tothe drawings., If have. illus.-

Each end.

v cup 5.

trated my lawn mower as comprising a one-pieceI frame unit I which may be termed a yoke. This yoke I (Figures 1, 2 and 3) is rigidly cast in one piece and preferably consists of a top bar 2, a bottom cutter bar 3 and vertically disposed connecting side arms 4. The bars 2 and 3 extend transversely substantially the full width of the mower and are integrally .joined to the arms I at theends thereof. The arms 4 have bearing cups 5 cast therein and these cups have their interiors machined properly to receive the bearings. The upper portion 6 of each arm 4 extends substantially vertically above the bearing cup 5 while the lower portion.l 'lof each arm is inclined rearn wardly. The cutter bar 3 is provided with a lower flat surfaceA 8, whichvis substantially horizontally disposed, against which is secured, by means of a plurality of longitudinally spaced clamping screws19', a cutter knife I0. The knife I3 (Figures 2 and 5) is provided with a forward cutting edge I-I.

The yoke I supports a cuttingreel. I3Which is of usual construction and which includes the spiders I'which carry the reelcutteri knives I5. The spiders I4 are carried by ashaft I6,the-ends of which extend into-the bearing cups.` 5l which contain the ball bearngunits I-I- (Figure) that. rotatably support the shaft. Foraccurately acl-:- justingr the cutting reelknivcs I5 relative; to the cutter barfknife AI I), mechanism like that! disclosed: in my co-pending application, Serial No. 665,868. is providedand includes anadjustable eccentric4 I8 which is associatedwitheach ofthe ballgbearings I- and is rotatably-disposed inthe-bearing The eccentric hasV an outer cylindricalf surface which rotatably tsinV the` bearingfcup,5y andhasl an inner socket I 9 which isflocatedeccen trically of the bearing cup and` which. receives.. they ball bearingy Irl; extends through an enlarged openingy 2n;at-,the, inner sidey of the cup. 5 so that the shaft may move laterally relativeto the.y cup. The shaft, fits-rotatably but tig-htlyin an opening 2| formed' in member I8 and which iseccentric'thereof. The shaft 4passes centrally through. thcvball bearing-v. I'I: Thus, itv will be` apparent that whenY the: eccentric IB is..r otated; theeshaft will' be mov-ed.y in such a mannery that its axis moveslaterally of the bearing cup 5. To rotate; the,v eccentrlcf I8and produce this movement, theeccentrlc has a worm gear portion 22 formedoniits inner side.-

This portion 22 is engaged by a,- worm 231 (Figures:

2 and 3) which is formed` on the lower end fofga; vertically, disposed wormshaft 2.4;. ThewolmiZB; and shaft 24 are disposed in averticaljsocketgZS.A

" formed asa part of thebearing cup 5jand which upwardly a sufficient distanceso that thisfknob willbe located conveniently.

It will be apparent that either.y of the eccentricsA I ilv can bev actuatedfto adjust the:corresponding endf of the shaftv |61 vertically andithat; suchadfjustment.y can be accomplished' conveniently. and: easily withoutthevuse of` tools.. .Because of .the-l worm and gear, theadjusting vstructure: willl be.-

.self-locking. Thestructure at .each, endof. the

The end of the shaft If shaft may be actuatedv independently of the other. This adjustment willmove theentre cuttingreel |3 vertically so that theknives l5 thereof may be adjusted closely relativeto the knife l carried by the cutter bar. Thus, either end of the cutting reel may bev adjusted independently ofl theother and with precision. y v

The shaft I6 has a pinion 23 (Figure 3) dis-` posed on each end thereof..l :These pinions 28 are loosely disposed on the shaft. Eachpinion has a clutch housing 29 formed on its inner end. Each of the housings 29 receivesia clutch unit 3|] which is of a free-wheeling typein common use. This clutch will serve to rotate the shaft I6 when the pinion 23 is rotated in one direction, but will not drive the shaft upon rotation of the pinion in the opposite direction. The opposite ends of the shaft IB extend into the supporting and driving `.wheels 3| and each of the pinions 28 is driven by means of an internal ring gear 32 (Figure 3) formed in each wheel. Each of the wheels 3| is ofthe structure disclosed in my co-pendingapplication, Serial No. 649,075, led February 20, 1946, now Pat. No. v2,432,621, granted December 16, 1947, and, therefore, need not be described in detail in this application. As shown best in Figure 3, each wheel 3| is carried by a stub `axle 33. This axle is provided with a reduced threaded inner end 34 which extends through an opening formed in the vertically disposed side plate 35 {,of the mower. The axle 33 is clamped to the plate 35 by means of a clamping nut 33 `threaded on the portion 34 of the axle.

Directly outside each side plate 35 (Figure 3) a gear segment disc 31 is disposed in abutting relationship thereto and withiny a recess 35a formed therein. The disc 31-is provided with a central opening in which a reduced part 34a of the axle 33 is disposed so that the disc is mounted for rotation about the axis. The disc 31 is provided with an outwardly projecting peripheral flange 38 which extends into an annular groove 33 formed in the periphery of the wheel 3|. Thus, the wheel is free to rotate relative to the disc 31, but the flange 38 extends into the groove 39 and effectively precludes the entrance of grass and dirt within the wheel 3|. Itwill be noted from Figure 4, that the side plates 35 are wider or higher at their forward ends than at their rear ends and `that both the forward and rear ends are ofl arcuate form. The two plates are rigidly secured together adjacent their forward ends to prevent'lateral movement thereof by means of the bumper bar 40 (Figures l and 7) which extends transversely the full width of the mower ahead of the cutting reel I3. Each end of the bumper bar 40 (Figure 3) is reduced, as indicated at 40a, and extends through an opening 43o (Figures 3 and 4) in plate 35 and through an arcuate slot 40e (Figures 2 and 6) in the disc 31. Thus, the ends of the bar 4|! are rotatably mounted in the openings 40h of the side plates 35,. Itwill be noted that the nut 36 and axle 33 serve to hold the side plates 35 and disc 31 in association with cach other, the shoulders 34h on axles 33 preventing the discs 31 from being clamped to the plates 35. The rear and lower ends of the side plates 35 carry the ground-engaging roller 4|, as shown in Figures 2, 3 and 7. The roller 4| is carried rotatably by a transversely 'extending shaft 42 that has reduced ends, each of .which extends into an opening 43 (Figure 4) inthe side plates .35 and is clamped thereto by means ,of a clamping nut 44. Thus, the plates 35 are rigidly connected together at their forward and rear end by means of a bumper bar 4|) and the roller shaft 42 which prevent relative lateral displacement of the side plates 35. Furthermore, as will be apparent hereinafter, the yoke cooperates with the side plates 35 to increase this rigidity.

In order to provide for proper adjustment to vary the depth or height of the cutting reel I3 and associated cutter bar Il), I provide means for vertically adjusting the yoke This adjustment is accomplished while maintaining substantially constant the angle of the cutter bar knife ||l relative to the ground. The yoke and, therefore, the cutting reel |3 and the knife iD which are carried by the yoke are moved vertically relative to the ground. To accomplish this each end of the yoke is carried by one of the gear segment discs 31, as illustrated best in Figures 2 and 3. As previously indicated, the gear segment discs 31 are disposed directly out-v side the plates 35. Each of the discs 31 is provided with a gear segment 46 formed on the inner edge of the slot 40e formed in the disc. The'slot 40o and the segment 46 are concentric with the axle 33. The reduced ends 43a of bar 40, as previously indicated, extend into the arcuate slots 4Go. Each of these ends of the bar carries a pinion 45a. which is keyed thereto and meshes with the gear segment 43 as shown best in Figures 2' and 3. A nut 43d threaded on each end of the bar 4|) serves to prevent displacement of1 the pinion 45a from the endsof the bar.

As previously indicated, the yoke is carried by the gear segment disc 31 so thatit will be adjusted vertically` upon rotation of disc 31 about the axis of the axles 33. It will be apparent that rotation of the discs 31 may be accomplished by rotation of bar 4B whichv rotates the pinions 46a that mesh with the gear segments 46 of discs 31. To mount the yoke on the discs 31, as shown best in Figure 3, the exterior of each bearing cup 5 formed on the yoke is provided adjacent its outer side with a reduced extension 49. The extension 49 lits into and is adapted to move within an arcuate slot 5|) (Figures 2, 3 and 4) which is formed within the side plates 35 and is concentric with the axle 33. The slot 50 extends from a point just behind the axle of the wheel 33 to a point just above the axle, as shown best in Figure 2. Threaded into the extension 49 of the bearing cup 5 is a nut 53 (Figure 3). This nut 53! has its inner edge engaging the eccentric I8 and serving to hold it in the bearing cup. This nut passes inwardly through an opening 53a (Figures 3 and 6) which is formed in the disc 31. The outer edge of the nut 53 is provided with al peripheral flange 54 which extends beyond the edges of the opening 50a.

In assembling this structure, the plate 35 at each end ofthe mower is positioned on the bearving cup 5 by slipping the extension 53 thereof into the arcuate slot 50 of the plate. The disc 31 is then positioned adjacent the side plates 35 and the wheel axle is clamped to the plate 35, the discs 31 being rotatably mounted on the axle. At the same time that the structures at each end of the mower are assembled, the opposite ends of the bumper bar 4U and the roller shaft 43 are properly connected to the plates 35. Thus, a complete rigid structure will be assembled.' The `rigidity is increased by the yoke due to` thefact that the nuts '53, which are threaded into the cups 5 carried by the yoke, are providedV 47 with the '.ilanges -54 which overlap the 'disc .13:1 and will thereby .prevent lateral .displacement of ftheside plates :35 .and associated parts. .Consequently,extre1ne rigidity of 'the entire mower` structure ,will result.

:It will :be noted from Figure 3 that .thenutE-l is provided with an .interior-chamber .59 -wl1i`ch receives .theclutch housingil. This chamber 59 .is of A.larger diameter .than the .housing ..28 in yorder to .permit .the required .lateral -displacementor the .axis of the shaft it whenthe eccentrics I8 are `rotated. Obviously,.this `.lateral displacement also causes-similar displacementsbf the .pinion .12.8. However, the 4.displacement vnecessary to obtain the precisionadjustment ofthe cutting reel i3 relative to .the cutter bar '..knife .I'B fis veryslight and will not .move .the pinion out of-.mesh with the ring gear 3'2.-of .thewheelL -From the above. description, it will be apparent that whenthe discs 3l are rotated by means of the bumper bar d, the yoke :I will be'moved vertically. The extension 9 of the bearing cups 5 will move along the slots Eil formed in the plates 35. Thus, the cutting l.reel I3 and the cooperating Icutting knife I0, which are both carriedby the yoke I, will be moved to different verticalpositions .to vary the height of cutbf the mower. :The arcuate slots 50 will always be covered :by thevdisc 3l so as to prevent the entrance of dirt and grass through these slots 5i! into the :wheels 3|. llt will be apparent that when the yoke I .is moved vertically, the pinions 28, carried by the cutting reel shaft IS, are also moved through arcuate paths. However, this willnot interfere with meshing of the pinions 28 with the internal gears 3l of the Wheels, due to the =factthat the centers of the arcuate paths of movement of the pinions Ztl coincide with the axis ofthe wheel axles 33 which are, of course, thecenters of thering gears 32.

Aspreviously indicated, it is desirable to maintain the cutter knife I at substantially the same angle relative to the ground, regardless of the vertical position of the yoke I, To accomplish this, as shown in Figures 1 2 and 4, an arcuate guide groove 46! is formed in the inner surface of each side plate 35 at a point above and slightly behind'the wheel axle 33. The yoke I carries at each side thereof a guide pin Sila which extends into the cooperating groove Se. The pins 50a are carried by the vertical portions 6 of the side arms 4 of the yoke adjacent the upper ends thereof. The grooves 60 are so Adisposed relative to the arcuate .slots 5t in plates 35 along which the bearing VVcups 5 move, that during vertical movement4 of the yoke I, the portionsf of the side arms will remain upright due to the vpins 60a operating lon the grooves 6E). During vrotation of the disc SI'Iabout the axles 33, the nuts -53 will rotate in the disc. Furthermore, the extensions 49 of bearing cups 5 will rotate in the arcuate slots 50 relative to `plates 35 and will move along suchslots. Thus, although-the'knife I0 willbe moved to different heights, the angle of the knife I0 -relative to the .ground will be maintained throughout vertical adjustment thereof.

For rotating the bumper bar tiliin order .to rotate the pinions 46a which, vin turn, rotate the discs 3-'I -to bring about the vertical radjustment of the yoke I, I provide avery lsimple strumure which is illustrated best inFigures l, 3 and '7. This structure comprises a :sleeve 6I which is splined to the bar 40 for axialbut non-rotative movement relative thereto. .One of these'sleeves is provided at each end of 'the bar 4U and is .provided with a iknurled .knob 62 by means fof whichdtimaylbezmovedaxially of the :bar and by meansfofwhich the bar maybe rotated. Within .the 'sleeve f.l-.around the-barAI) achamber 63 is formed .which receives :acompression spring 64. Thisspring bears ationeendagainst the closed inner end of chamber 63 and at itsopposite end against afcollar S5 which is fixed to the .bar 40. The .spring .-64 normally urges `the sleeve 6I towardsthe adjacentplate 35. The inner end of thesleeve 6I isprovided with a pin Yi which is adapted .fito cooperate with .any of a pluralitybf circumierentially spaced indentations ,'61 (Figures 1,2fand I4) `whichare provided Ain the .inner surfacefof plate-35 around the opening 40h through which the Ibar 40 passes. Normally, rotation of the bar 4U will be .precluded .because the pins 66 carried by membersfll will be forced into indentations 61. However, .when it is desired to rotate .thebar 541i, both fof the sleeves 6I may be pulled ouirwardlyby` aigrasping knob '62 and, consequently, the .ipins will be withdrawn from the indentations. rIihen the bar 4B may be rotated by rotating the knobs-B2. It will be noted that thecolla'rs BSiare ofsufciently small diameter to permit the. chambers 63 and the sleeves 6I to move over such ,collars.

The vhandle '150 .ofthe mower may be of any suitable ',typea-nd may be `pivotally attached to the side plates Vl'3 5 by means of inwardly extending .pivot-pins 1.1 whichiare formed on the interior of theplates 35 as shown best in Figures 2, 3 and 4. Spacedrstops 1,2;a-re also formed on the inside of plates 35 adjacent their upper edges to limit swingingfmovement of the handle 10 about the pivot pins -1 I. An opening I3-may be provided on the inside fof'each of the ,plates 35 adjacent the opening Y13,for receiving the grass catching basket or container Aof the fmower.

It .will be apparent'from the above description that vI.,-have;provided a ysimple yet effective structure -.for .quick-ly, easily .and accurately adjusting themower =to vary the Adepth of cut. This adjustment.isaccomplished without the use of tools. Themeans for rotating the segment-carrying disc 3l to vbring aboutthisadjustment is very simple in structureand operation. The adjusting knobs can-befreleased with little effort and will automatically-lock themselves when released after the bumper bar Ahas been rotated. The assembly at each sidefof or end of the mower is very simple merely consisting Yof a side plate, a segment-carrying-disc and a Wheel, the plate and disc being so arranged relative to the wheel as to prevent the entrance .ofdir-t and grass thereinto.

In Figures y8 and-,9,1 have illustrated a modiiied arrangement .for producing the vertical adjustmentof the yoke and the cutting mechanism carried thereby. yIn this instance, the bearing structures 5a, and associated parts, provided on the ends of .the yoke Ia .extend through an arcuate slot 50h which is concentric with the axle 3c. lnthisiinstance, .I not only provide the side plates 35h but also fcover plates 35e outside the side plates. .Between the plates 35h and 35e -I provide a gear segment member v31a which is mounted .for .swinging movement -about the axle 34e. It will be apparent that by swinging the segments 31a vertically, fthe yoke 'I will be moved vertically. 'To swing the segments vertically I provide train of gears'locatedin a chamber "35d formed v:at ea'chside V'of the mower between the rear lparts of the plates 35h and 35e. Each of these train of 'gears embodies a pinion 4Gb which meshes with Y"the -gear teeth 46c of the segment 31a. Meshing` with the pinion 46h is an idler pinion 46d whichv engages an actuating pinion 46e. The pinions 46e are keyed to the roller shaft 42a. When the roller` shaft 42a is rotated, the gear segments 31a will be swung about the axles 34e and the yoke l will be moved vertically. For rotating the shaft 42a a knob 46f is provided inside one of the plates 35h and is keyed to the shaft.` A pin 46g is associated with this knob and normally extends in one of a plurality of circum" ferentially spaced notches formed therein. When this pin is withdrawn, the knob 45T may be rotated to-rotate the shaft 42a. Thus, in this form of my invention, I also provide a very simple arrangement for moving the yoke la vertically.

The slots b formed in the side plates 35h and the pins 60e which cooperate therewith and are carried by the yoke la, function in exactly the same manner as the slots 60 and pins BUaof the preferred form of my invention to keep the yoke I a, vertical. The bumper bar We passes through aligning openings in plates 35h and 35e and its ends are bolted to the plate 35C.

In forms of my invention the adjustment to vary the height of cut of the mower is accomplished by simply rotating a bar or shaft, for example, the bumper bar or roller shaft, which is mounted on the mower parallel to the cutting reel shaft which is to be moved vertically. Such bar orshaft is geared to the gear segments which are mounted for movement about the axes of the wheelsand which carry the cutting reel shaft and associated parts which are to be moved vertically. Thus, the required adjustment at both sides of the mower can be accomplished with ease by rotating a single member.

It will be apparent from the'above description that I have provided a lawn mower of an extremely rugged construction. The construction is such that the adjustment for varying the height of cut and the adjustment of the cutting reel relative to the cutter bar knife can be accomplished with ease and accuracy without the use of tools. Furthermore, the structure is such that the various gears and similar parts are protected from clogging by dirt or grass. Various advantages of my mower structure have been discussed above. Others will be apparent from the preceding description, the drawings and the following claims.

Having thus described my invention, what I claim is:`

`1. A mower comprising a frame carried by wheels, a second frame carried by the first frame and supporting the cutting reel and associated cutter knife of the mower, means for adjusting the second frame vertically relative to the rst frame, said means comprising gears which carry the second frame and which are mounted on the first frame for movement about the axes of said wheels, and means for moving said gears about said axes, said means comprising a transversely extending shaft rotatably mounted on the first frame and being geared to said gears, and means for rotating said shaft to produce movement of said gears.

2. A mower according to claim l whereln said shaft is the bumper bar carried by said rst frame ahead of said cutting reel.

3. A mower according to claim 1 wherein said shaft is the shaft which supports the groundengaging roller and is carried by said first frame |behind said cutting reel.

4. A mower comprising a frame carried by wheels, a second frame carried by the .first frame `f` 10 and supporting the cutting reel and associated cutter knife of the mower, means for'adjusting the second frame vertically relative to the rst frame, said means comprising gear segment discs which are rotatably mounted on the rst frame on the axles of said wheels and means for moving said discs about said axles, said means comprising a transversely extending shaft rotatably mounted on the first frame, a pinion on each end of said shaft for rotation therewith and engaging the gear segment of the associated gear segmentdisc, means for rotating said shaft, and means for normally locking said shaft against rotation. l

5. A mower comprising a frame which includes side plates rigidly connected together by a transversely extending bumper bar at the forward side of the mower and a ground-engaging roller at the rear side of the mower, supporting wheels mounted on said side plates by axles which are rigidly secured thereto, a second rigid frame which supports the cutting reel and associated cutter knife of the mower, a segmentfcarrying disc mounted on each of said axles outside of the `associated side plate, said side plates being provided' with arcuate slots which are concentric with said axles, said second frame having members on each end which extend through said slots and are secured to said discs, means for rotating said discs to produce vertical movement of said second frame relative to the first frame, said means comprising pinions on the ends of said bumper bar which engage the segments of said discs, and means for rotating said bumper bar.

6. A mower according to claim 5 wherein the segment on each disc is formed on the edge of a slot formed therein which is concentric with the axle with which it is associated, the pinions on the ends of said bumper bar being disposed in 9. A mower according to claim 5 wherein meansl is provided Vfor maintaining substantially constant the angle ofthe cutter knife relative to the ground regardless of the vertical position of said second frame, said means comprising guideways on said side plates and guide members carried by the second frame and cooperating with said guideways.

l0. A mower according to claim 5 wherein said second frame comprises vertically spaced transverse members and connecting side members rigidly connected together, said cutting reel having a shaft which is journaled in bearings supported on said side members, one of said transverse members being provided with a knife edge.

11. A mower comprising a frame which includes side plates rigidly connected together by a transversely extending bumper bar at the forward side of the mower and a ground-engaging roller at the rear side of the mower, supporting Wheels mounted on said side plates by axles which are rigidly secured thereto, a second rigid frame comprising vertically spaced transverse members and connecting side members rigidly connected porting wheels mounted ont-said side plates -by -axles ywhich are #rig-idly :secured thereto, 'said wheels being; provided with;.internal-,gears,na :segment-oarry-ingtdisc'fmounted. for-rotation on yeach of-.said axles routside off-the associatedlsideplates,

1saidsidefplates.being :provided uwith Aarcuate `slots Which-fareconcentriciwithaidraxles and 4through which `theends of saidcuttingfreelshaft pass, said ends salsopassingthrough. openings. formed in said ;disos, Ta .pinior1 on eeaohtend. ,cf..said. shaft meshing vith the .internal .gears of:.said wheels, means tor. rotating saiddiscs to Aproduce vertical movement .of said secondramemelative to Vthe first frame, said. means .comprisingpinions on the ends: of said .bumper bar which. engage the segmentsnoffsaiddiscs,isaidbumper harA being rotatably; mounted. ori-said side platesfand. extending through aligning.v openingsinsaid sideplates Aand into -arcuate slots in-.said..discs which are concentric `withsaid axles, the pinionsrbeingidisposcd in :said .slots and imeshing vwith fgear segments formedA on -the edges .thereof means for rotating said humperf bar,..and means. fonnormallylocking saidbumper baragainst. rotation.

12. A moweraccordingto claimll wherein the segment-carrying discs .close the inner sidesoi said wheels .and lit l-nto l recesses .formed .in -the outer sides ofv said sideplates 13. A mower according to claim L11 .wherein said means for rotating said Lbumper har. comprisesa knob keyed .to -said ,bar .adjacentoneof said ,side plates, said `'knob tbeingimovable axially of sa'dbar`-but being normally urged into contact with said .plates by aspring associated therewith, the adjacent ,parts of :.saidknob and said plates .having portions which normally intert witheach other.

14. A mower according .to claim 11 `wherein means is .provided Lfor maintaining 4substantially constant the angle ,of )the cutterknfe relative to the gro und-regard1ess of .the vertical .position of Asaid second frame, said means comprising guide .grooves .'formed on the inner surfaces of said side plates, andguidepins carried .by the sidemembers. of said secondframe .and extending intoisai'd. grooves.

15. A mower comprising a frame which includes side plates rigidly connected together `.by a vtransversely extendingbumperbar at. the f orward side of the.mower an`d aground-engaging roller at the rear side of .the mower which is `U12 earrieddoy.Y a1shaft -.1otatably mounted vonffsaid side plates, supporting -wheels mounted f on said side `.plates by axles whicharef:rigidlyY securedftheroto,

a= second rigid .'rame :which supports the cutting Lreehand associated cutter 'knife -of=the:mower, a .fgear -:segment mounted-oneachfof -said axles outside-of ithe 'associated "iside g-.plate, said side plates l"being .provided 'with arcu-ate ,slots -Which rare coneentricwith-said ax'lesgsa-id second frame having members lon each end which extend through said `'slots and are :secured Yto said segments, .-.and1.means 'for vswinging -'-said segments .about .esa-id axles fto @produce vertical f movement yof-\said-.second frame'relative tothefrst frame, said r'means comprising.- a l tra-inof hgears between :saidirollere shaftV and-said=segments1fandactuated Hoy: rotationrof-said shaft.

16. f'A .mower ,according 'to claim `.15 4including means for :normally :flocking fsaid -shaft against rotation.

v17. A mower accordingtd dai-m15 whereinithe cutting reel is; provided with :ai shaft-whichfis substantially parallelto theweutter-kniferandis .carried by-.bearings supported .fby-said-fsecondframe and means lTis associated with -said fbearings 'for moving the lends of -said shaft -relative toffsaid frame to i moverse/id cutting treel relative 'to `said knife.

`1.8. A lmower according y-to :claim 1 "wherein means is-associated-.with saidfgearsfor: maintaining.substantiallyfconstantithefanglefoffithesoutter knife :relative ito .the :ground lregardless -of Ythe vertical position of saidsecondfframe.

.19. Amoweraccording to claim-ivvhereinguide means isFprovidedbetween-said.1 fiiames forimaintaining substantially -..constant the tangle ...of the cutter -`knife:relative -zto the ground regardless-of the vertical-.position .ofsaidesecondframe.

BENNY :TNGROBOWSKI.

`REFERENLES .CITED {Fhe following references vare fof `vlrecord in lthe le of :this rpatent:

Number Name lDate .2,152,252 .Godwin .et-al .Mar.-28, 1939 .2,283,161 Boonton .May v19, 1942 .2,340,849 Wildebooraetal Feb.f8, 1944 2,388,165 Lowe et al. Oct-.30,1945

'.FOREIGN 4PATENTS Number Country Date 113,287 *Australia June 9,;1'941 379,462 'Great'Britain Sept 1, 1932 

